as per ur symptoms i feel you are having allergic dermatitis
and so you are having itching alongwith other symptoms of allergy
like difficult breathing..
there are many reasons for this .one being family history and the other important one being decreased immunity ..another reason is worm infestations and deficiency of vitamins iron and minerals..
hence i suggest u to check out all these and better u start taking iron supplements
and one dose of albendazole
tablet alongwith symptomatic treatment with antihistaminics like cetrizine
and also u need to check out if ur allergic to some particular things which provoke these symptoms in u and try preventing these allergic things in your life..
hope u will get well soon ..take care..